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NXLOG works over udp, not in tcp

Hi,
I'm new in NXLOG and Graylog. I'm using nxlog to send Windows server log to Graylog,
My final goal is to transfer and log in ssl, but proceed by step. All my machines are on my company lan
The configuration of NXLOG with OM_UDP

does not work correctly
In graylog i recive 1 message / minute Instead of 15/20 which I receive with the udp onfiguration,even if the Graylog input message counter reports about 20 / minute. It seems that most messages are discarded as incorrect
On Graylog server firewall port 12201 tcp/udp is open, and on windows server 12201 port is open too.
I have no idea what's going on. thank you